Anyone out there try this with boost? I've often wondered why the mustanger's can run 8-10psi on their stock bottom ends for what seems like forever and not bust the pistons. I don't think their pistons are any stronger than ours since both are hypers. Even my import buddies install turbos or superchargers and run upwards of 10-15psi or so on stock engines and they last for years.... and again they're using cast or hyper pistons like we have. I'm just guessing it's due to the lower CR.

Looking at the TFS heads with thier larger chambers and playing with the CR calculator on this site shows they'll drop the CR down to about 9.3:1. Seems like that CR would allow us to run boost with reliability and longevity. Everyone jumps on the "it'll blow up" idea as soon as they hear it.... which is mostly true... but 100% of the time when it happens the person who did it was still running stock compression. I've been searching for a while on different forums but never see anyone trying it or discussing the idea.

Rich, Bret, Injuneer, anyone.... have any ideas or opinions on this? Are our stock pistons just too weak for boost? Even at lower CRs? Why can they handle 150-175 shots of nitrous for long periods of time but just a little boost will blow them up?

 

You could go that route, though I don't know much about the TFS heads per se. In addition, you could get some Cometic gaskets in a "custom" thickness to lower the CR still further. It might work well, though I can't say for sure.

The 5.0's had forged pistons, at least the ones I have seen. The modular motors do have HE pistoms though.

Rich

 

93-95 302's had hypers . But that would be interesting if this idea did work out. An easier way to safely boost an LTx would be nice.

 

so how much boost will a well tuned stock motor lt1 or ls1 handle?

 

I think there was a shop car ls1 that put down 740(or around there) to the wheels stock bottom end with alcohol injection and their turbo kit. I know there was a guy who made just over 600(I want to say 612, but it was a while ago) to the wheels stock bottom end on a lt1. He was putting in a new motor and boosted it up until the bottom end went out. I believe it was with an s-trim and no intercooler.

 

..wow.thats way to much im only wanting to get to 400 horse or so i need my motor to last til spring.

 

You shouldn't have a problem making 400 to the wheels on 6psi which is safe if tuned right and should last a while.

 

you think?im just trying to figure out how to run 2 turbos and have them only put out 6-8psi.or if i knew what kind of single turbos to use off someother car or truck,how about disiel trucks?i can get one off a fuso or an international.